Shuttle for sewing-machines



J. SIGWALT, Jr.

SHUTTLE POR SEWING MACHINES.

No. 254,509. l Patented Mar. 7,1882.

UNITED STATES PATENT v OFFICE.

JOHN SIGWALT, JR., OF ARLINGTON HEIGHTS, ILLINOIS.

. SHUTTLE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 254,509, dated March 7,1882.

Application filed July 2, 1879.

To all whom it may concern Be it known that I, JOHN SIGWAL'I, J r., ofArlington Heights, Cook county, State of Illinois, have invented a newand useful Improvement in Shuttles for Sewing-Machines, of which thefollowing is a full description, reference being had to the accompanyingdrawings, in which- Figure l is a plan showing the face of the shuttlewith the cover closed. Fig.2 is the same with the cover open. Fig. 3shows the side 0pposite Ato that shown in Fig. 1. Fig. 4 shows that edgeof the shuttle which is toward the top of the sheet in Fig. l. Fig. 5shows the edge which is opposite to that shown in Fig. 4. Fig. 6 is thesame as Fig. 4, the shuttle being turned over and a portion cut away.Fig. 7 is a section at fr of Fig. 1. Fig. Sis a detail. Figs. 'Z and Sare enlarged.

This invention relates to certain improvements in shuttles forsewing-machines; and it consists in a novel construction and combinationof parts, which will be first fully described in detail, and thenspecifically pointed out in the claims.

In the drawings, A represents the shuttlecase.

B is a bobbin, located in a chamber in the case. The bobbin properconsists of two heads, a b, and a central piece, c, which is hollow,

. forming a chamber, d. One end of this chamber d is partly covered bythe head b, which has a central hole in it; but the other end of thechamber is not so covered.

c is a pin, which is inserted in the chamber d at the large end thereof.It has a shoulder which prevents it from passing out at the opposite endof the chamber. AOne end of pin e is smaller than the main part, andprojects through the hole in the head b, forming a journal, j', for thebobbin. This journal f runs in a suitable depression on the inside ofthe case.

g is a coil-spring between pin, c and block h, and in the chamber d, toproduce a slight tension. When e and the spring-g have been inserted inthe chamber d it is closed by a round block, h, `which projects a littlebeyond the head a and forms the other journal, j, for the bobbin.

C is a swinging cover, pivoted to the case at i. It covers thebobbin-chamber or a part of it, and has a hole in it, which receives thejournalj when the coveris closed. This cover must fit closely over thewalls, with which it comes in contact when closed. There is a lip, 7c,and a notch at the inner end of the cover.

D is a disk-tension, located in a chamber in the shuttle near the point.It is constructed as shown in Fig. 7.

fm is a disk having a hub on one side. another disk upon this hub.`

o is a pin having a head,p, at one end and a screw-thread at the otherend, which enters a screw-threaded hole, q,in the bottom or lower sideof the case.

r is a coil-sprin g between the disk m and the head p and around pin o.As shown, there are two small holes in the head p, to receive a wrenchfor the purpose of adjusting these tension devices. The head p iitsrather closely the chamber which receives and holds the tension devices.

E is a slit cut in the caso A. It commences at s in the edge ofthe case,which point is also in the wall of the bobbin-chamber, and first passesthrough such wall and through the case in a slanting direction to thecenter of the edge of the shuttle-case, thence in a straight line to thepointof the shuttle, and thence to the point t in the under edge of theshuttle. This part of the slit is cut through the wall of thetension-chamber, so that the thread can be passed through the slit fromthe point of the shuttle and between the disks m u. From the point t theslit is carried up in a slanting direction to the point u in the edge ofthe case, which point u is nearly opposite to the points. Near the pointu the slit is not cut through the wall of the bobbin-chamber, but isdeep enough to allow the thread to pass freely behind the lip lc whenthe cover G is closed.

The cover O can be swung around to permit the bobbin to be removed andreplaced. It is held in its chamber by the cover O, the journal fbeingin the recess or depression in the case and the journalj being in thehole in the cover. The action of the spring g will hohl the centralportion ot' the 'nead a against the inside of the cover C and press theend of the jonrnalj against its bearing, producing a little friction andpreventing the bobbin from moving too far, as each stitch is taken, whennis ICO

the motion is rapid. The bobbin having been placed in its chamber, theshuttle can be easily threaded by passing the thread -into the slit E atthe point s, then in the slit at the point of the shuttle, drawing itinbetween the disks m n, then from the point t along the groove or slit tou. During this operation the cover is to be open; but vafter the threadhas been brought to the point u the cover is to be closed, when the lip7c will cover the slit at u and prevent the thread from escaping. Toclose the cover and bring the hole in it into the right position toreceive the journal, the bobbin can be pressed down into the chamber,compressing the spring g and permitting said cover to pass over the endof the journal j. To open the cover the bobbin should first be presseddown in the same manner. To enable the operator to do this convenientlya portion ofthe bobbin is left exposed, as shown at Fi g. 1 The tensionon the thread can be adjusted by means of the tension devices described,the thread passing between the disks m n, the pressure of the spring rbein g adjusted by turning the head p. This can be done without removingthe shuttle from the machine, if desired.

I do not limit myself' to the exact location of the slit E shown. It maycommence at a point nearer the heel instead of at s.

What I claim as new, and desire to secure by Letters Patent, is asfollows:

1. The shuttle-case A, provided with cham- -bers for the bobbin and thetension device, and

having its end constructed with a slit, E, which extends inwardly ashort distance in a straight line, and thence passes in a slantingdirection through the shuttle-case into the chamber containing thetension device, substantially as and for the purpose described. y

2. The combination, with the case A, provided with a slit, E, and coverC, of the tension device and bobbin B, as and for the purposes setforth.

3. The combination, with the case A, provided with a slit, E, and coverO, of the bob bin B, having a `yielding bearing,f, and a tensionmechanism, as and for the purposes set forth.

JOHN sIGwALT, JR. y

Witnesses:

J Mins S. McKENNEY, L. XV. WHITING.

